#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main() {
    int m = 0;
    scanf("%d", &m);
    int final = ((m + 1) * m / 2) * 2 - 1;
    int first = final - (m - 1) * 2;
    int i = 0;
    for (i = 0; first < final; first += 2)
    {
        printf("%d+", first);
    }
    printf("%d", final);
    return 0;
}